Locking and masking can be done via a pattern, PIN, password, or your fingerprints.
Apps will be locked once the screen turns off. Once apps are unlocked, they will remain unlocked until the screen turns off.
Masking an app will block notifications from it and mask it on your phone. Only downloaded apps can be masked .

Disclaimer:
The default duration of Secure Wi-Fi sessions is 6 hours. Opera Max can be used to extend the session duration every 6 hours, up to 48 hours in total.
Turn on Secure Wi-Fi to set up a VPN connection and monitor your network traffic.
Some websites and content might not be available while this function is on, depending on the service provider or mobile network conditions.
Some websites may not be able to locate or track your IP address.